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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afaea3943fa41cdac945c214033b8617305994cf346e87e6872f9326d6eb0af7' 
  AND token = 'om4esoUk7ASKX8l5tdW5BNxAkO+bTV36N8FIpu+sH88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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