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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcd97572fac83a8f9ba265dc5a604e8d0a138b3f9012aedfa62d1955871574e' 
  AND token = 'lyC7IPDAScSyUswQECgp5wUDlX6g6dKSN8aGgjgvfXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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