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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428bad8da067ed9a0a53675eb23ba68a9e929ccda5945b080362d32894880228' 
  AND token = 'egTdl3jbCxYC7T+QqW9kM/i2z0OTeU2Z1aD1Pk4L5WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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