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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439eef9aae2f2b3172f670b4a6174a27b3ce8c2e9acc33d43574f1eca9638b20' 
  AND token = 'cr2bYBUxuilonuYzkE0s6iR0OpInROoZ9XB2kkfdEds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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