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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51d2a8ea0bda6280b7b23cb9a7d83ce33232e938b3f918d45fae6ebfc6d308d' 
  AND token = '6TJhOPQNgZPMetysR1dOof/lOkJcRzlNRasz5NXkRH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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