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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ffd2575802b70d4419d06f8991eafbb1da072cb4343ff26aebd857db9853eb9' 
  AND token = '6tMZuZp9PpI3zneQxpXQcvHMR6S4CrZ1Xm13egH6LvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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