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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4eacf96a2a9bba7eb96292474c2f72972410ec62236505839e26cdec11944ef' 
  AND token = 'ODCu1988Rtyx/QCCFyEC0rlzEvVUjOHOU3HHw+AUkKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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