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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73edc2c51031890f1b1e28c9d41af65588c230fb44612fb2a9a780fbeaf3f4a' 
  AND token = 'S0+nsiSHQb8frrBb30plr4RwwAQiDRa7OfrqvRTvft4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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