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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12e007829736c7df6c57b67f4a8e587fe79715d451d9c353ed08b4ca741d1f5' 
  AND token = '4cQcb6c0+ylsx8Jf3HoB8Y2cJNyPQ7FNk3iaWCGFXXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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