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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f52c70900a135ddcb56939b284053de8ee4a32bf7569b836a2aa1ea044f3914' 
  AND token = 'vHvSjXbiurPTkx98/gMTALvBtdy6rUZBg1CrPykx/MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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