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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8791b028a3f3d3fb7bfa48cd72d079f009d76f7724407fd62de7d7d581e5ea' 
  AND token = 'wn+0M6reCTDc7yzR/FrE8Oe9J26egMokvwPZ02cV1UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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