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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a54503886fb9a8e46a62cc2aad5e4fb3f158fd9bd3337b4dcc4eb68f53841f' 
  AND token = '70d/DJunnlYzxo7n1MnScdyQBlTzPmkQxWih/P8gFzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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