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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c13eece75d577a26da13f61b60476d892b82984afe8f630b828237512d2dd1f' 
  AND token = 'FpP6T0Q14Rc9wS4lR7Hb0RcUHHrBqq4BrxcazxCe+mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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