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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea95d06651fae8926cb8f55b4b2f7e4c56d61b3d38bfa9a9b09d42196b096b8e' 
  AND token = 'sAuJlOsSwTO8l0JikhhNHEXb/m3mtL5it/OCs7DJ2gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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