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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35b084863fb224fdf7cb5081c3bd9311d779ae608d87b7b7a5b81e87b877c70' 
  AND token = 'R/qqhWbNbv2J2t7iKz9kbi0vOZh33saiQ+DTglQxfSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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