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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74d4bb3b259e84e34b23271d3c3debfb1ed912c75e69f3cc8923c954ac541e6' 
  AND token = '5+WchL5PUI9Fr4+etn7HLdAOzXox6tDrgEjebKcTi+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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