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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1574c45106902b5ad87bdea9f8e4798384637f5b8ee23719cdad9159d4068578' 
  AND token = 'PzyjDCySL+o2VNls32FJDCRD0950TJRVLOofje2dn8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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