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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae9e8e5e76a1d304c2ad162c516c8588fc8d29a720db848c4f3dd31277f0eae' 
  AND token = 'kvzTSLqgTtU6Y8kKwoq9x+/2QumOanO8R2iebtNFIb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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