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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4acc09eb2035a024eabf954f13acb5ca8d6f6fc0df1132f34dcc29f5ff9430' 
  AND token = 'aqyBHOU0KUDhbMXRxHc+e/d70ygXZoE3kZYald4bzEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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