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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97dfacfd1d51d6881d9fb6ae621e3e7660210d7d1f5ece67a5158448acf5ae9a' 
  AND token = '/YcHWjcAbt7SZc/Iyz/CxIPWOeFX9a0DiqeJ9pOb+iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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