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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936a8be55d342f271489a7c9e2c35bfa848f7dbee5fd079061aac04248ec2d91' 
  AND token = 'I/YMICkn3Xt9opiz/rEelOdKxnT4qsD9fSHpaLZtXBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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