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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30937c0e7c00810e82ea8e8053025c0ab1f707e198afdd9c6ea7856146c8a88f' 
  AND token = 'Wz332e8ZWliUbBJHUnYwx5im+NAHy63gBZLzL1jIRRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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