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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7e28051286f2105a36b5485319836cd712ed39a942350c74aebd8e89202fc5' 
  AND token = 'twevOU67OIVM4g4wlfjJDCVXCDAh8hCMRJpd8t1V8n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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