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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f922b30939c080813a7132f85eec779bcec88184b96dcff1b28a51a824ffcaf4' 
  AND token = 'dSMck2kBm0VmvTw3P7Xlw4bMFpraG3tvWy2pqcXA1Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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