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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc68f866c418906a534c4ca13b18a0628af869327e213dca4e0dad149d611ca' 
  AND token = 'gai6QNOhIS5I6MFmnqoCZa3EOP2jo3grpvKxBU7mv6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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