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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2ac1c4bf8b8cc2939e2bdef77a74e9a619d0a8ca7cd0f5956f2bd25166dff8' 
  AND token = 'XcdCshEAvKSLTzznqc5bX2kCUwqbUQ0+XXi68V/UnPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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