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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e31d363b2859b26d56801930ada7a80195047a61ec80bdfea2b22c04bd4e14a' 
  AND token = 'xvRKH/P/1G10e69xE7PQMBunvd0Cp7qRq0DAUlbCec4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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