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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62caaaa10532b13ebde6fbc16e947c583ed2c20836ee029664eb11d2b589a328' 
  AND token = 'KSon7jSrvh7KDbzjztGPzirOTZ9Gw9O4G5J4CNhovrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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