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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a76588e2bb7a336bc0fddf9d9578ddcc7bffb45753c0d43339ba5e773be599c' 
  AND token = 'qwxWQSR2dt0pgtu8kKNe5BjgENymjQJv8FSZXekYMsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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