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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb86b5a32b58fa34fc6ab705bc668348c580b778bad58bb8064dbea07fd37a7' 
  AND token = 'cBZI0xwKtuzseYjbkIuUde6hFO9hrORllq798qD/ce0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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