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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9dacd5ec57384edf27589e6b66fbb75e66d329c827f432bd9eb105c8f8a811' 
  AND token = 'cOulQCh7HqeM9MhA60eXItP6Ch1y6VOPmPV2YhgKnu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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