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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915f226bf873bd6b5e532e904cd7e2e8cbc52ed4f29932de21aff55e77b8d676' 
  AND token = 'CBKQoQj7FiZccp1zEUstSi6ni22We1sjFZB482ie3ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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