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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bc42cb09b9c01f11cc80c8862e7069b1a80ea131b5e9d53710a07c0f73fdd2' 
  AND token = '1ta3WiMCiPi6aq5zTnkXaHj+nlDNtfdSn4xX0jleCko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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