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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1795f34cea850ce5ce5141c02656249d3da7e04aac4064e8527322c3e558eb' 
  AND token = 'pqGVDCno/jOm6tSfzDF4Tu+3XlX8vP3kGK5kkqEPi1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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