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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9a5b12f7789cb3a670276cc3b0aa7c0ec1864d2904d46caa26aee100a09ec5' 
  AND token = 'NUlZxF56fA+JACSTM1/nJewgtykU777r3BxFqzj0Yw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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