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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657080d79be9a894bb456def76ba3c60a0e7ff54d983e1d3a2ca7449645908f7' 
  AND token = 'sOOzHhsiG6zrq8HrbT6nswzlToQi1T6X5lnlvsHZ0iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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