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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9e5f1213209fd141266268b26f261de2b2f9d604bed34be29defd5328df2d1' 
  AND token = 'W9Qg4IA6si4dHxUhHTOGcD7kkT/4T6C62+rjfAD8qWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.02509

JSON explain

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