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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01cac0d3dc4addc5ef4cec3aa8a3c46fc2c7dd2e8afd90c586e1bf908c986c67' 
  AND token = '+4R0AXWTDN158lRRdbDIPGS4oTTYOKhqc4STRZhorlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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