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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4163f7f2b0f29b0dbdff9218ae315b4e99290d667bbba325efee1e904681039f' 
  AND token = 'CvM1FT1fTjRi3rkWewfg0MqM3jd/huGiVgqKhSWUpbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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