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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d350ab1f339f070591669a42476ae02c4a4322baadd272ee11ac546dbaa861' 
  AND token = 'ZpVm1T0kEX8+oO5PRHMMcXsWdxow+kdmnfS61Y9aHyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}