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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2cb8b39556595be5573da96e05cb5094aceb4ab9b2ae88151aa4b2167769db' 
  AND token = 'F5IdCih6SHmesoZ2Wjd+phHBTgkqDs1860rYQM8A6xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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