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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6cf8e22c00a356a3c49220b0ba37a8f8cac57751fe94eadb5e26f1f39914ea' 
  AND token = '/t/LVs3ngvkrVlRUbcmh9OCJeOlkQdDUDLH89vjIagE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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