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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9f584ae3d420ab0c6df7be0a96b2dd66e1e399edd99deac7fdc9d2c9b1d787' 
  AND token = '7aaBO1o1fasU69T0zFnTNTGU8BtUUN8I3vLFYGGdYpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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