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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f6c35d332cb0474b87c80a41d27a4d5aab776dec2584c9fa5ca93715c933d0' 
  AND token = '0b9fMZ4sQCliv3NyE3+RDNnOryYdcoknlnHzlvj3ppA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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