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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce16c89e3f54b778d7344eeb2c9da8a390bf3a092bac62ea0493c00415762cc0' 
  AND token = 'ElwiI853pb6rHNJqoeu1qxi0E47teat6/IHg6XcIXAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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