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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7277de43ed214323e793d33a44f60dcef59bb7b14a58b5c23c8b95cae0e254fb' 
  AND token = '9YIZs7qWbaYjFWtPe14UFk+EurC5efXsD6YaEBGCgDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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