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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1673abf81a670d2a34c2d3398e89ecad4041c8adc2c5807b4dc29571c2c6d1ad' 
  AND token = 'VFAIhseWotYLr5zzBzHuAQXrIRr0dBNE/BKd/2f5Aos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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