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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae46cce6c35adac37dac3dede4418707910a31a8f164fb891e64a00750a610c' 
  AND token = 'RNjJ2q5TxZb37xMhrep4a7AO6RHei/DRiDOPE3wI42U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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