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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df634c2a62a6cb90716117506ef2a72d3742dcf328526dc73295102b4e058fd7' 
  AND token = 'p8cwx/6TbwVdhdhaXKIV1dPWwejjd0wotEfi2qCut2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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