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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0684339ab6c18631a3613ba3b0f9ac6c5cc3e8bd0ecb34827bf69a389b87df33' 
  AND token = '8pewCfKU6dfmYK4uJCN2Caf5o9VC5FKqTrtehin3irM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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