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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db397908f09dd4acd54260f7b34046d8bf49a6a259e90dd74e6597fba615d6e' 
  AND token = 'pwyX+2QbeVbqfdgGqXfg4Jbjoiui1vnXp6xtuQGl2BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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