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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58daafbb8a23e04edc4f7866ab258db082e9492aec10c97bbf9dc0c5ad061ee5' 
  AND token = 'JvmdH1LNg7b5PXShbEqlYxNPcqqRzXZSbSFKaoXoryk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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