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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bec4a9d362528c050423bf0d068ecd9a1c569ec3cf7554dda7a1a74c68e174' 
  AND token = 'XR97+U8Y51dAy3frOG3FsIP+pW+K4caZleFMTNajCUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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