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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c5ef48d200d4ef8aee7cc69edf56fe99b84a29a685727a5219d16ce22a8118' 
  AND token = 'Mnj2Wr4Db6Q4vAwinvXtzOpD7XNM3iRewTxxe6k3i4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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