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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704d9b768b9f58cf164ef1a669ee449ff0212a3d912967fb29583c306b9a223b' 
  AND token = 'DiVLwcgWKPMdldouoLL+B4JXcc1Tj6NUBGMcL9TAnBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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