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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0102462b1be36811c6a77ad244a35f643a6fada0c41475033cd31962b5b7e4e' 
  AND token = 'o7awtE8W7Bs5HB5+AWzaOp2BxAclZskd1FemcWxRfiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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