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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131fb81daa2c9389e6e0f6fbe46fe7b96e7242acef5f8ba4b5b8dc4fc37a7ef4' 
  AND token = 'groODOn2tEEjluf83dioSCNQf1e5igbvuhxcD9jl4y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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