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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea19b0369f1da2cfa344c8c1a96efaa85e0ba7bc26ae1cd7bc443edb7f85ecde' 
  AND token = '9mAa6Dk1Yft2ZFrRKr+PL5Nm+VOlvRZMFnE4Kkwerqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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