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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97164968f0199eb3aa48ae412221976db5ce72173e1656030600c873ac707c78' 
  AND token = 'S/mEZjW13TdUdXz3CUnU0Tyi8js7qThAYL04JDvfz8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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