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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254859e42db37ae09584320c682f2b789a345df4b3cdc5a5e27ca2af5e51a9c8' 
  AND token = 'dHZK1iRV6/dMf+pElSz9WuBNkEmYrmIAgym7el1tKnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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