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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aec905779a027cb637a0840739de532ce8800ad63e3c862de2cf523fdcbef06' 
  AND token = 'WIPjyojewasliSyYM+2l2BJTSlvCEh509x0IQWxezN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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