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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24764c1e047db9030e1026e3830ec8f080b215e64a4af7a0565fc235a4799c78' 
  AND token = 'Wm3drYizD2495vzXBhxSkdBBHMk68RwhFdPTwJUs24w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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