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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dada762bf8bfef8b2583051bc91aa07a11baf7fe400f6018dc72c1bf0cc470b' 
  AND token = 'DB7x7h8DWWgBbfRijpis4RoIXSVMf+B04IbqXe8gGso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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